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PID controllers are widely used in various application fields. The desired control performance for a nonlinear system cannot be obtained easily because of the difficulty of the gain selection for PID controllers. To improve the control performance of a PID controller, we present a switching action for taking advantage of the robustness of SMC and keeping the simplicity of the PID controller. For the...
There are great demands in various applications on discovering unknown relationships in graphs that have not been found yet or will appear in the near future. The B-coupling relationship is one of predictable relationships in bipartite graphs. Some previous works predict B-coupling relationships by using a unimodal graph. The unimodal graph includes only one node type where links denote B-coupling...
Wireless sensor networks have been widely used for environment monitoring and event surveillance. In recent years, the skyline query, as an important operator for multiple-criteria decision making, has received much attention because of its many real-world applications. In this paper, we propose a new filter-based method, called SKYFILTER, for skyline query processing. Our method provides an enhanced...
Retrieving similar images based on its visual content is an important yet difficult problem. We propose in this paper a new method to improve the accuracy of content-based image retrieval systems. Typically, given a query image, existing retrieval methods return a ranked list based on the similarity scores between the query and individual images in the database. Our method goes further by relying...
Given a set of objects, the skyline query returns those objects which are not dominated by other objects in the same dataset. An object o dominates another object o' if and only if o is strictly better than o' on at least one dimension and o is not worse than o' on the other dimensions. Although the skyline computation has received considerable attention recently, most techniques are designed for...
A user who wants to get information from a relational database needs to know database schema and structured query languages like SQL. The ordinary users are not familiar to those things, so searching information from relational databases is hard to them. Keyword search is a solution of the problem, where a keyword query is a simple and user-friendly search model that can be issued by writing a list...
In this paper, we propose an ontology-based lifelog management system, called OntLMS, which is built by utilizing the existing lifelog management system based on the relational data model. We design ontology for modelling lifelog data and provide both one-time and incremental conversion methods that transform lifelog data in the relational database into ontology. Our system supports expressive, user-centric...
In wireless mobile computing environments, broadcasting is an effective and scalable technique to disseminate information to a massive number of clients, wherein the energy usage and latency are considered major concerns. This paper presents an indexing scheme for the energy- and latency-efficient processing of full-text searches over the wireless broadcast data stream. Although a lot of access methods...
A wireless sensor network is a collection of sensor nodes distributed over a geographic area to monitor physical conditions, such as temperature, light, humidity, or pressure. Since a sensor node has limited energy supply, running multiple continuous monitoring queries may impose significant overhead on the sensor network. In this paper, we propose an energy-efficient multiple query optimization method...
Top-k monitoring queries are useful in many wireless sensor network applications. There is a well-known approach called FILA to process this kind of queries. Its basic idea is to install a filter at each sensor node to avoid unnecessary transmissions of sensor readings. FILA uses two algorithms to ensure the correctness and efficiency of the approach: a query reevaluation algorithm and a filter setting...
Several methods to index positions of moving objects have been proposed. Most of them are based on R-tree-like index structures. Some studies have made efforts to improve the update performance of R-trees, and they actually focus on query performance. Even though the update performance has been improved by virtue of those researchers' efforts, the overhead and immaturity of the concurrency control...
In this paper, we propose the localization algorithm using vector histogram matching method in environments with perpendicular walls. Conventional histogram matching method gets the wrong rotated value, because it has matched between other angle values when is a sharp rotation. In our proposed method, we do match angle values using direction of data. This method gets reference data and current data...
Bursty and out-of-order tuple arrivals complicate the process of determining the content and boundary of sliding windows. To process windows over such streams, two issues need to be addressed: how to sort input tuples efficiently and how to estimate punctuations. In this paper, we focus on these issues to process sliding windows efficiently and accurately over disordered streams. Regarding the first,...
For energy-efficient event-detection in sensor networks, we can perform an in-network join of two relations, i.e., a sensor table and a condition table, where a condition table is a set of tuples each of which contains condition information about a certain event. In this paper, we propose an in-network method for efficient join of a sensor table and a condition table. We also show through performance...
The advances in ubiquitous computing technologies have given rise to the u-Business, where we obtain business-related context information from ubiquitous devices to adapt to the changes of business environments in a timely manner. In these rapidly changing u-Business environments, we need a mechanism to modify business process schemas, which represent a group of business activities arranged in a meaningful...
To make BNT-BT ceramics, in this study, we put amount of small BaTiO3 (BT) which has the characteristics of the ferroelectric and the tetragonal structure at the normal temperature in BNT. The temperature goes up very fast to the maximum, 100degC for first 3 minutes and then it is saturated. We can recognize from the P-E curve that much more generation of heat is accompanied the impressed electric...
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